[w3c/browser-payment-api] Update allowed to use check. (#364)

Use the active document of the browsing context to make the allowed to use determination.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/364

-- Commit Summary --

  * Update allowed to use check.

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/364.patch
https://github.com/w3c/browser-payment-api/pull/364.diff

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